Customer uploaded photos show up in Google Maps listings instead of what the owner uploaded

Seems I take care of this issue every so often only to have it occur again. This time it doesn't look like I'm able to fix it. Why do customer uploaded images override what the owner has uploaded as the business' preview images? Looking at my listing in the iPhone app of google maps, the thumbnail image that shows up when my business is listed among other businesses, as well as the 5 swipeable preview images that show up when you view my listing, used to be attractive images that I uploaded to represent my business. They have been replaced by customer uploaded images that are blurry, dark, and in some cases hardly representative of the business at all. Why does this happen? I've had to reassert my own images' precedence several times in the past when this happened, and it was tricky to figure out then. Now it seems I can't do it at all. Why would images uploaded by customers become the preview images for an establishment instead of the images that the owner himself chose to represent his business. Goodness me.